here's the ip: minecraft.blockzone.org:25300
Blockzone has multiple worlds for you to play on. There are survival worlds, creative worlds, and pvp worlds. When you first get on, you can go to the guest world, which is one of their creative worlds. I mostly hang out in the flatlands, which is another creative world.
My best friend is Lead-Mod, however one of the admins has a reputation for blowing up people's stuff with tnt.
There are some really annoying things on this server. This was the only server I was ever griefed on and it takes FOREVER for the server to update.
Overall this server is good. It's one of the servers that I go on a lot and I have a lot of goo builds there.